>Does anyOne have some code or an appl that can dial a phone number via a 
>modem, and if the line is busy redial after a user defined delay.

Dialing is super easy; just send "ATDT555-1212" (with the right number, 
of course) to the serial port. Getting a busy signal indication back 
requires listening to the port for a response from your modem. I've not 
done this, since last time I talked to a modem they didn't support it, 
but you might try digging in the modem "technical manual" for a clue as 
to what gets returned under different circumstances. I know my current 
(much newer than the 300-baud job I coded for) modem now "knows" when a 
line is busy, as opposed to just getting "no carrier" for busy/no 
answer/answer with no modem signal, because some software I use knows the 
difference. However, I'd assume it's a "nonprintable" modem response, as 
opposed to the "CONNECTED" of a good connection, since I see nothing "on 
screen" in my terminal emulator in those conditions.

For "stable" responses from the modem, you may also need to "get it's 
attention" first, in case it's already connected; that's "<esc>+++" and 
watch for an "OK" back. "ATH" is the command to hang up, and it also 
returns "OK"; many, many other commands and responses should be in the 
technical manual.

If you don't have a decent manual, I'd search around the Hayes web site; 
all these commands were designed by Hayes, years ago, and they should 
have some documentation on the "standard" set that all (normal) modems 
recognize. These "standard" commands are a _great_ improvement over the 
old way of every modem being different... (anyone else ever write to the 
"current loop" connector on an Apple ][ at 110 baud?)

Bill